Improved multiferroic in EuTiO_(3) films by interphase strain engineering  

作　　者：Yiyan Fan Shiqing Q.Deng Tianyu Li Qinghua Zhang Shuai Xu Hao Li Chuanrui Huo jiaou Wang Lin Gu Kuijuan Jin Oswaldo Dieguez Er-jia Guo Jun Chen 

机构地区：[1]Beijing Advanced Innovation Center for Materials Genome Engineering,Department of Physical Chemistry,University of Science and Technology Beijing,Beijing 100083,China [2]School of Mathematics and Physics,University of Science and Technology Bejing,Bejing 100083,China [3]Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [4]Institute of High Energy Physics,Chinese Academy of Sciences,Bejing 100049,China [5]Department of Physics,University of Chinese Academyof Sciences,Beijing100049,China [6]Songshan Lake Materials Laboratory,Dongguan 523808,China [7]National Center for Electron Microscopy in Beijing,School of Materials science and Engineering,Tsinghua University,Beijing 100084,China [8]Department of Materials Science and Engineering,Faculty of Engineering,Tel Aviv University,Tel Aviv 6997801,Israel

出　　处：《Chinese Chemical Letters》2023年第7期379-383,共5页中国化学快报（英文版）

基　　金：supported by the National Key Basic Research Program of China(Nos.2020YFA0309100 and 2019YFA0308500);the National Natural Science Foundation of China(Nos.21825102,22001014,11294029,11974390,11721404);the China National Postdoctoral Program for Innovative Talents(No.BX20200043);China Postdoctoral Science Foundation(No.2021M690366);the Beijing Nova Program of Science and Technology(No.Z191100001119112);the Beijing Natural Science Foundation(No.2202060);the Guangdong-Hong Kong-Macao Joint Laboratory for Neutron Scattering Science and Technology,the Strategic Priority Research Program(B)of the Chinese Academy of Sciences(No.XDB33030200);the Fundamental Research Funds for the Central Universities,China(Nos.06500145 and FRF-IDRY-20–039);State Key Laboratory of New Ceramic and Fine Processing Tsinghua University(No.KF202110)。

摘　　要：Interphase strain engineering provides a unique methodology to significantly modify the lattice structure across a single film,enabling the emergence and manipulation of novel functionalities that are inaccessible in the context of traditional strain engineering methods.In this work,by using the interphase strain,we achieve a ferromagnetic state with enhanced Curie temperature and a room-temperature polar state in EuO secondary phase-tunned EuTiO_(3) thin films.A combination of atomic-scale electron microscopy and synchrotron X-ray spectroscopy unravels the underlying mechanisms of the ferroelectric and ferromagnetic properties enhancement.Wherein,the EuO secondary phase is found to be able to dramatically distort the TiO_6 octahedra,which favors the non-centrosymmetric polar state,weakens antiferromagnetic Eu-Ti-Eu interactions,and enhances ferromagnetic Eu-O-Eu interactions.Our work demonstrates the feasibility and effectiveness of interphase strain engineering in simultaneously promoting ferroelectric and ferromagnetic performance,which would provide new thinking on the property regulation of numerous strongly correlated functional materials.

关 键 词：EuTiO_(3) Magnetic phase transition Polar state Interphase strain engineering 

分 类 号：TB383.2[一般工业技术—材料科学与工程]